Method of repairing furnace linings



June 24, 1930. .1. E. ANDERSON 1.765,558

METHOD OF REPAIRING FURNACE LININGS Filed Nov. l, 1926 Patented 24, 193@TENT JOHN E. ANDERSON, F CHICAGO, ILLINOIS, ASSIGNOR TO PLIBRICOJOINTLESS FIREBRICK COMPANY, OF CHICAGO, ILLINOIS, ,AA CORPORATION OFILLINOIS Applicationnled November 1, 1926. Sierial No. 145,483;

This inventionrelates to furnace construction, and more particularly toamethod of and means for repairing or patching refractory linings used infurnaces.

i It very frequently happens that defectsv in the l'ning of the furnacenecessitate the removal of the defective portions and the consequentrepair or patching of the lining. It also happens that the lining isinjured by removal of clinkers therefrom or, in some cases, by the slicebars used in conditioning the fire. In all such cases, it becomesnecessary to remove. the defective portion, or the injured portion ofthe lining and replace the same by patching. `Great difficulty isfrequently experienced in securing the patch in such manner as toeffectually anchor it to the main or-body portion of the lining and thisresults in a serious weakness in the lining as a whole. This isparticularly true where the lining is of monolithic construction as, insuch case, the material of the patch cannot be readily bonded with thelining so as to form an integral part thereof.

I have found that the above objections can be overcome by providingsuitable anchoring members which engage between the furnace wall and thelining, these members extending into the opening for receiving the patchand being embedded in the material of the patch, thus effectuallyanchoring the patch to thelining. yOne of the main objects of theinvention is to provide a methcd and means of the character statedwhereby ak patch can be r readily applied to a monolithic furnaceconstruction at small cost and can be effectually anchored in positionso as to form, in effect, an integral part of the main portion of thelining. A further obj ect is to provide anchor f4() members which can bereadily produced at small cost and can be readily appliedy between thelining and the furnace wall in position to become embedded in thematerial of the patch. v'Further objects will appear from the detaildescription.

In the drawings Figure 1 is a fragmentary vertical sectional Viewthrough a furnace wall construction showing the wall and the lining,including the patch, in section and also showing two of the anchormembers as applied;

Fig. 2 is an inner face view of the wall structure looking at thelining, the patch being indicated and the anchor members being shown indotted lines; f

Fig, 3 is a detail perspective view of one ofthe anchor members.

The method and means of my invention are particularly adapted for use inconnection with a furnace construction including a brick Wall l of knownconstruction provided on its inner face with a lining 2 of refractorymaterial, though it is to be understood that the method andfmeansreferred to for effecting repairs or patching of the structure can beapplied to furnace wall constructions' of various types.

In the particular construction illustrated, the lining 2 is ofmonolithic construction being formed ina continuous sheet or layer builtup from refractory material applied vto the inner face of the wall in aplastic condition. In practicing my method cf repairing the lining, inthe event that a defect develops in the lining or the lining is injured,this defective or injured portion is removed by cutting an opening inthe lining extending from the inner face thereof to the wall l, thisopening being preferably rectangular in outline and the wall surroundingthe opening being :j I,

disposed at right angles to the wall 1. It will be understood, however,that the opening formed for receiving the patch may be of other shapethan rectangular if desired or if required by circumstances. After theopening for reception of the patch has been formed, anchor members 3 aresecured in position to extend into the opening so as to be embedded inthe material of the patch Il. Each of the anchor members 3 is of approx-Y imately Z-shape and is formed from a single length of strap steel orother suitable material which is bent to provide the shank portion 5 andthe terminal elements 6 which are disposed at right angles to shank 5and are oppositely related. Preferably the elements 6 and shank 5 areall of the same length rendering it possible to produce the anchor atvery small cost. In applying the anchor, one of the arms 6 is drivenbetween wall 1 and the lining 2. Preferably the element 6 is drivenbetween the wall and the lining to its full length so that the shank 5bears against the lining 2 and is braced thereby against movementoutwardly of the opening, laterally thereof. With the anchor 3 disposedin this manner, the shank 5 extends into the opening from wall l and theother terminal element or arm 6 extends into the opening of the patch atright angles to lining 2, that is in the plane of the patch 4.

After the opening has been cut through the lining 2 and the anchor hasbeen properly positioned, in the manner stated, the material of thepatch 4 is placed in the opening to form the patch. This material ispreferably similar to the material of which'the lining 2 is formed andis applied in a plastic conditiom,

being firmly pressed and packed into the opening so as to completelyfill the same and completely surround and enclose the shanks 5 and innerelements 6 of the anchors. The anchors are thus efect-ually embedded inthe patch 4 and serve to anchor the same tightly in position so as tofoim, in effect, an integral part of the lining 2. Vhen thoroughly driedand vitrified, the patch 4 becomes united with the lining so as to avoidany undesirable crack or opening about the lining, which wouldei-*entually develop a Weakness in the same, and expansion andcontraction of the patch occurs simultaneously with expansion andcontraction of the main portion of the lining 2. As stated, the patch 4is preferably formed of the same material as lining 2 and is, therefore,of monolithic construction, though other suitable materials may be usedfor the patch. Where some material other than that of which the lining 2is formed is employed forv the patch 4, and the rate of expansion andcontraction of the material of the patch is materially different fromthe expansion and contraction of the lining 2, it may be desirable tospace the shaiiks 5 of the anchors 3 away from the surrounding wall ofthe openings Which receive the patch to accommodate, to a certainextent, this difference in expansion between the patch and the lining,as well as the difference between contraction of the patch and thelining. Under ordinary conditions, however, the anchor members aredisposed with the shank portion 5 thereof closely adjacent thesurrounding wall of the patch receiving opening. I contemplate disposingthe anchor members with the Shanks thereof away from the Wall of thepatch receiving opening, however, when this seems desirable ornecessary.

What I claim' is l. A method of repairing a lining in a furnaceconstruction including a wall and a lining therefor, consisting inremoving the defective or damaged portion of the lining and forminganvopening extending from the inner face of the lining to the wall,inserting anchor members between the wall and the lining and disposingsuch members to extendmto the opening, and then filling the opening Withmaterial forming a patch and enclosing. and

surrounding the anchor members sopas to embed the same in the patch. l

2. A method of repairing a lining in a furnace construction including awall and a lining therefor, consisting in removing the defective ordamaged portion of the lining and forming an opening extending from theinner face of the lining to the Wall, inserting to extend into theopening, Aand then filling the opening withv plastic material forming amonolithic patch, the anchor members being enclosed by and embedded inthe'patch.

4. A method of repairing a furnace Wall structure consisting in removingthe defective or damaged portion of the structure to form an openingextending from one face thereof, positioning anchor members in theopening with elements thereof secured between the thickness of materialcorresponding to the depth of the opening and the remaining thicknessVof the structure, and then filling the opening with material forming apatch, theY anchor members being enclosed by and embedded in the patch.K

5. A method of repairing a furnace Wall structure consisting in removingthe defective or damaged portion of the structure to form an openingextending from one face thereof, positioning approximately Z-shap`edanchor members in the opening With their' outer terminal elementsinserted between the thickness ofthe structure corresponding to thedepth of the opening and the remaining thickness of the structure, andthen filling the opening with material forming' a patch, the anchormembers being enclosed by and embedded in the patch.

6. A method of repairing a lining in a furnace construction including awall and alinizo ing therefor, consisting in removing the defectve ordamaged portion of the lining and forming an opening extending from theinner face of the lining to the Wall, driving the outer terminalelements of anchor members between the Wall and the lining about theopening and disposing said anchor members to project into the opening,and then filling the opening With the material forming the patch, theanchor members being embedded in the patch.

In Witness whereof, I hereunto subscribe my name this 29th day ofOctober, 1926.

JOHN E. ANDERSON.

